"It's no longer possible to write a single app that takes advantage of the full range of Mac OS X features. Some APIs only work inside the Mac App Store. Others only work outside it. Presumably, this gap will widen as more new features are App Store-exclusive, while sandboxing places greater restrictions on what App Store apps are allowed to do." Anybody surprised by this, here's the clue stick. Please proceed to hit yourself with it.

But also that older applications won't work any longer, so I'm not sure this would be such a good idea.

Maybe this won't seem a big deal to people used to the $0.99 apps, but other people have made quite an investment in software, you know? Not to mention that some applications are no longer maintained and won't receive an update -- and can't be easily replaced anyway.

RT.

Apple don't tend to care. They care about getting cash off of you quick. TBH if you want a cross platform app ... make it some sort of HTML 5 thing.